IAB Standards

Published Modified

  • Image
  • Display

IAB Standards Flexible 4:1 Billboard ad specs

IAB Standards Flexible 4:1 Billboard ads are horizontal 4:1 still images, at least 900×225 px, up to 0.25 MB per file, delivered as JPG, PNG, GIF, or HTML5. They run in the Top or bottom of page, edge to edge placement on IAB Standards.

  • min 900×225 px
  • 4:1
  • 256 KB
Test a creative

Visual

Minimum size
900 × 225 px
Aspect ratios
4:1
Max file size
256 KB
File types
JPG, PNG, GIF, HTML5

Notes & source

  • Flexible unit: keep the 4:1 ratio and scale between 900×225 and 1800×450 density-independent pixels (dp)
  • Minimum width and height are in dp, which equal pixels at 1x density
  • Build at 2x for sharp screens
  • Static image size 1800×450 dp
  • Initial load up to 250 kB, subload up to 500 kB
  • Max file size is the initial-load k-weight: IAB applies the initial load limit to static image ads and backup images
  • Weights are gzipped and count every file the ad requests before the page load event
  • Subload starts after it, and user-initiated loads are unlimited
  • At most 10 file requests during initial load
  • Exempt shared libraries add up to 50 kB
  • Ads stay muted unless the user starts audio, and must be clearly distinguishable from content (a border is the usual way)
  • On 3G or slower connections IAB asks for file weights 30% below these limits

Official source · checked not yet

Official source · checked not yet

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